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revision 105 by ph10, Tue Mar 6 16:32:53 2007 UTC revision 195 by ph10, Mon Jul 30 13:23:28 2007 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 7.1 05-Mar-07  Version 7.3 05-Jul-07
5  ---------------------  ---------------------
6    
7   1. Applied Bob Rossi and Daniel G's patches to convert the build system to one   1. In the rejigging of the build system that eventually resulted in 7.1, the
8      that is more "standard", making use of automake and other autotools. There      line "#include <pcre.h>" was included in pcre_internal.h. The use of angle
9      is some re-arrangement of the files and adjustment of comments consequent      brackets there is not right, since it causes compilers to look for an
10      on this.      installed pcre.h, not the version that is in the source that is being
11        compiled (which of course may be different). I have changed it back to:
12    
13   2. Part of the patch fixed a problem with the pcregrep tests. The test of -r        #include "pcre.h"
14      for recursive directory scanning broke on some systems because the files  
15      are not scanned in any specific order and on different systems the order      I have a vague recollection that the change was concerned with compiling in
16      was different. A call to "sort" has been inserted into RunGrepTest for the      different directories, but in the new build system, that is taken care of
17      approprate test as a short-term fix. In the longer term there may be an      by the VPATH setting the Makefile.
     alternative.  
18    
19   3. I had an email from Eric Raymond about problems translating some of PCRE's   2. The pattern .*$ when run in not-DOTALL UTF-8 mode with newline=any failed
20      man pages to HTML (despite the fact that I distribute HTML pages, some      when the subject happened to end in the byte 0x85 (e.g. if the last
21      people do their own conversions for various reasons). The problems      character was \x{1ec5}). *Character* 0x85 is one of the "any" newline
22      concerned the use of low-level troff macros .br and .in. I have therefore      characters but of course it shouldn't be taken as a newline when it is part
23      removed all such uses from the man pages (some were redundant, some could      of another character. The bug was that, for an unlimited repeat of . in
24      be replaced by .nf/.fi pairs). The maintain/132html script that I use to      not-DOTALL UTF-8 mode, PCRE was advancing by bytes rather than by
25      generate HTML has been updated to handle .nf/.fi and to complain if it      characters when looking for a newline.
     encounters .br or .in.  
26    
27   4. Updated comments in configure.ac that get placed in config.h.in and also   3. A small performance improvement in the DOTALL UTF-8 mode .* case.
28      arranged for config.h to be included in the distribution, for the benefit  
29      of those who have to compile without Autotools (compare pcre.h).   4. Debugging: adjusted the names of opcodes for different kinds of parentheses
30        in debug output.
31    
32   5. Updated the support (such as it is) for Virtual Pascal, thanks to Stefan   5. Arrange to use "%I64d" instead of "%lld" for long printing in the pcrecpp
33      Weber: (1) pcre_internal.h was missing some function renames; (2) updated      unittest when running under MinGW.
     makevp.bat for the current PCRE, using the additional files !compile.txt,  
     !linklib.txt, and pcregexp.pas.  
34    
35   6. A Windows user reported a minor discrepancy with test 2, which turned out   6. ESC_K was left out of the EBCDIC table.
36      to be caused by a trailing space on an input line that had got lost in his  
37    
38    
39    Version 7.2 19-Jun-07
40    ---------------------
41    
42     1. If the fr_FR locale cannot be found for test 3, try the "french" locale,
43        which is apparently normally available under Windows.
44    
45     2. Re-jig the pcregrep tests with different newline settings in an attempt
46        to make them independent of the local environment's newline setting.
47    
48     3. Add code to configure.ac to remove -g from the CFLAGS default settings.
49    
50     4. Some of the "internals" tests were previously cut out when the link size
51        was not 2, because the output contained actual offsets. The recent new
52        "Z" feature of pcretest means that these can be cut out, making the tests
53        usable with all link sizes.
54    
55     5. Implemented Stan Switzer's goto replacement for longjmp() when not using
56        stack recursion. This gives a massive performance boost under BSD, but just
57        a small improvement under Linux. However, it saves one field in the frame
58        in all cases.
59    
60     6. Added more features from the forthcoming Perl 5.10:
61    
62        (a) (?-n) (where n is a string of digits) is a relative subroutine or
63            recursion call. It refers to the nth most recently opened parentheses.
64    
65        (b) (?+n) is also a relative subroutine call; it refers to the nth next
66            to be opened parentheses.
67    
68        (c) Conditions that refer to capturing parentheses can be specified
69            relatively, for example, (?(-2)... or (?(+3)...
70    
71        (d) \K resets the start of the current match so that everything before
72            is not part of it.
73    
74        (e) \k{name} is synonymous with \k<name> and \k'name' (.NET compatible).
75    
76        (f) \g{name} is another synonym - part of Perl 5.10's unification of
77            reference syntax.
78    
79        (g) (?| introduces a group in which the numbering of parentheses in each
80            alternative starts with the same number.
81    
82        (h) \h, \H, \v, and \V match horizontal and vertical whitespace.
83    
84     7. Added two new calls to pcre_fullinfo(): PCRE_INFO_OKPARTIAL and
85        PCRE_INFO_JCHANGED.
86    
87     8. A pattern such as  (.*(.)?)*  caused pcre_exec() to fail by either not
88        terminating or by crashing. Diagnosed by Viktor Griph; it was in the code
89        for detecting groups that can match an empty string.
90    
91     9. A pattern with a very large number of alternatives (more than several
92        hundred) was running out of internal workspace during the pre-compile
93        phase, where pcre_compile() figures out how much memory will be needed. A
94        bit of new cunning has reduced the workspace needed for groups with
95        alternatives. The 1000-alternative test pattern now uses 12 bytes of
96        workspace instead of running out of the 4096 that are available.
97    
98    10. Inserted some missing (unsigned int) casts to get rid of compiler warnings.
99    
100    11. Applied patch from Google to remove an optimization that didn't quite work.
101        The report of the bug said:
102    
103          pcrecpp::RE("a*").FullMatch("aaa") matches, while
104          pcrecpp::RE("a*?").FullMatch("aaa") does not, and
105          pcrecpp::RE("a*?\\z").FullMatch("aaa") does again.
106    
107    12. If \p or \P was used in non-UTF-8 mode on a character greater than 127
108        it matched the wrong number of bytes.
109    
110    
111    Version 7.1 24-Apr-07
112    ---------------------
113    
114     1. Applied Bob Rossi and Daniel G's patches to convert the build system to one
115        that is more "standard", making use of automake and other Autotools. There
116        is some re-arrangement of the files and adjustment of comments consequent
117        on this.
118    
119     2. Part of the patch fixed a problem with the pcregrep tests. The test of -r
120        for recursive directory scanning broke on some systems because the files
121        are not scanned in any specific order and on different systems the order
122        was different. A call to "sort" has been inserted into RunGrepTest for the
123        approprate test as a short-term fix. In the longer term there may be an
124        alternative.
125    
126     3. I had an email from Eric Raymond about problems translating some of PCRE's
127        man pages to HTML (despite the fact that I distribute HTML pages, some
128        people do their own conversions for various reasons). The problems
129        concerned the use of low-level troff macros .br and .in. I have therefore
130        removed all such uses from the man pages (some were redundant, some could
131        be replaced by .nf/.fi pairs). The 132html script that I use to generate
132        HTML has been updated to handle .nf/.fi and to complain if it encounters
133        .br or .in.
134    
135     4. Updated comments in configure.ac that get placed in config.h.in and also
136        arranged for config.h to be included in the distribution, with the name
137        config.h.generic, for the benefit of those who have to compile without
138        Autotools (compare pcre.h, which is now distributed as pcre.h.generic).
139    
140     5. Updated the support (such as it is) for Virtual Pascal, thanks to Stefan
141        Weber: (1) pcre_internal.h was missing some function renames; (2) updated
142        makevp.bat for the current PCRE, using the additional files
143        makevp_c.txt, makevp_l.txt, and pcregexp.pas.
144    
145     6. A Windows user reported a minor discrepancy with test 2, which turned out
146        to be caused by a trailing space on an input line that had got lost in his
147      copy. The trailing space was an accident, so I've just removed it.      copy. The trailing space was an accident, so I've just removed it.
148    
149   7. Add -Wl,-R... flags in pcre-config.in for *BSD* systems, as I'm told   7. Add -Wl,-R... flags in pcre-config.in for *BSD* systems, as I'm told
150      that is needed.      that is needed.
151    
152   8. Mark ucp_table (in ucptable.h) and ucp_gentype (in pcre_ucp_searchfuncs.c)   8. Mark ucp_table (in ucptable.h) and ucp_gentype (in pcre_ucp_searchfuncs.c)
153      as "const" (a) because they are and (b) because it helps the PHP      as "const" (a) because they are and (b) because it helps the PHP
154      maintainers who have recently made a script to detect big data structures      maintainers who have recently made a script to detect big data structures
155      in the php code that should be moved to the .rodata section. I remembered      in the php code that should be moved to the .rodata section. I remembered
156      to update Builducptable as well, so it won't revert if ucptable.h is ever      to update Builducptable as well, so it won't revert if ucptable.h is ever
157      re-created.      re-created.
158    
159     9. Added some extra #ifdef SUPPORT_UTF8 conditionals into pcretest.c,
160        pcre_printint.src, pcre_compile.c, pcre_study.c, and pcre_tables.c, in
161        order to be able to cut out the UTF-8 tables in the latter when UTF-8
162        support is not required. This saves 1.5-2K of code, which is important in
163        some applications.
164    
165        Later: more #ifdefs are needed in pcre_ord2utf8.c and pcre_valid_utf8.c
166        so as not to refer to the tables, even though these functions will never be
167        called when UTF-8 support is disabled. Otherwise there are problems with a
168        shared library.
169    
170    10. Fixed two bugs in the emulated memmove() function in pcre_internal.h:
171    
172        (a) It was defining its arguments as char * instead of void *.
173    
174        (b) It was assuming that all moves were upwards in memory; this was true
175            a long time ago when I wrote it, but is no longer the case.
176    
177        The emulated memove() is provided for those environments that have neither
178        memmove() nor bcopy(). I didn't think anyone used it these days, but that
179        is clearly not the case, as these two bugs were recently reported.
180    
181    11. The script PrepareRelease is now distributed: it calls 132html, CleanTxt,
182        and Detrail to create the HTML documentation, the .txt form of the man
183        pages, and it removes trailing spaces from listed files. It also creates
184        pcre.h.generic and config.h.generic from pcre.h and config.h. In the latter
185        case, it wraps all the #defines with #ifndefs. This script should be run
186        before "make dist".
187    
188    12. Fixed two fairly obscure bugs concerned with quantified caseless matching
189        with Unicode property support.
190    
191        (a) For a maximizing quantifier, if the two different cases of the
192            character were of different lengths in their UTF-8 codings (there are
193            some cases like this - I found 11), and the matching function had to
194            back up over a mixture of the two cases, it incorrectly assumed they
195            were both the same length.
196    
197        (b) When PCRE was configured to use the heap rather than the stack for
198            recursion during matching, it was not correctly preserving the data for
199            the other case of a UTF-8 character when checking ahead for a match
200            while processing a minimizing repeat. If the check also involved
201            matching a wide character, but failed, corruption could cause an
202            erroneous result when trying to check for a repeat of the original
203            character.
204    
205    13. Some tidying changes to the testing mechanism:
206    
207        (a) The RunTest script now detects the internal link size and whether there
208            is UTF-8 and UCP support by running ./pcretest -C instead of relying on
209            values substituted by "configure". (The RunGrepTest script already did
210            this for UTF-8.) The configure.ac script no longer substitutes the
211            relevant variables.
212    
213        (b) The debugging options /B and /D in pcretest show the compiled bytecode
214            with length and offset values. This means that the output is different
215            for different internal link sizes. Test 2 is skipped for link sizes
216            other than 2 because of this, bypassing the problem. Unfortunately,
217            there was also a test in test 3 (the locale tests) that used /B and
218            failed for link sizes other than 2. Rather than cut the whole test out,
219            I have added a new /Z option to pcretest that replaces the length and
220            offset values with spaces. This is now used to make test 3 independent
221            of link size. (Test 2 will be tidied up later.)
222    
223    14. If erroroffset was passed as NULL to pcre_compile, it provoked a
224        segmentation fault instead of returning the appropriate error message.
225    
226    15. In multiline mode when the newline sequence was set to "any", the pattern
227        ^$ would give a match between the \r and \n of a subject such as "A\r\nB".
228        This doesn't seem right; it now treats the CRLF combination as the line
229        ending, and so does not match in that case. It's only a pattern such as ^$
230        that would hit this one: something like ^ABC$ would have failed after \r
231        and then tried again after \r\n.
232    
233    16. Changed the comparison command for RunGrepTest from "diff -u" to "diff -ub"
234        in an attempt to make files that differ only in their line terminators
235        compare equal. This works on Linux.
236    
237    17. Under certain error circumstances pcregrep might try to free random memory
238        as it exited. This is now fixed, thanks to valgrind.
239    
240    19. In pcretest, if the pattern /(?m)^$/g<any> was matched against the string
241        "abc\r\n\r\n", it found an unwanted second match after the second \r. This
242        was because its rules for how to advance for /g after matching an empty
243        string at the end of a line did not allow for this case. They now check for
244        it specially.
245    
246    20. pcretest is supposed to handle patterns and data of any length, by
247        extending its buffers when necessary. It was getting this wrong when the
248        buffer for a data line had to be extended.
249    
250    21. Added PCRE_NEWLINE_ANYCRLF which is like ANY, but matches only CR, LF, or
251        CRLF as a newline sequence.
252    
253    22. Code for handling Unicode properties in pcre_dfa_exec() wasn't being cut
254        out by #ifdef SUPPORT_UCP. This did no harm, as it could never be used, but
255        I have nevertheless tidied it up.
256    
257    23. Added some casts to kill warnings from HP-UX ia64 compiler.
258    
259    24. Added a man page for pcre-config.
260    
261    
262  Version 7.0 19-Dec-06  Version 7.0 19-Dec-06
263  ---------------------  ---------------------

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